Is there any activity the Pulsense device cannot monitor?

• Detecting a pulse may be difficult when you lift your arms above your head, tightly grip something, or exercise vigorously.

  Note: Do not wear the device when you swim. The device is water resistant to splashes such as rain or when you wash your hands, but water from a tap or spigot may have enough pressure to compromise the water resistant feature. Do not use the device where water pressure changes rapidly.